MTA good work strike

In the comments on this thread, Kevin hits upon what I think is a pretty good idea for the MTA workers in NYC – a “good work” strike. The primary reason for the vehemence towards the strike (as near as I can tell) seems to be focused on the fact that the strike harms consumers and indeed the entire city as much as it harms the MTA. The traditional technique to avoid this problem in the past is the “good work strike”, which has been used successfully both in NYC and by transit workers:

In 1968, Lisbon bus and train workers gave free rides to all passengers to protest a denial of wage increases. Conductors and drivers arrived for work as usual, but the conductors did not pick up their money satchels. Needless to say, public support was solidly behind these take-no-fare strikers.

In New York City, I.W.W. restaurant workers, after losing a strike, won some of their demands by heeding the advice of I.W.W. organizers to ``pile up the plates, give ‘em double helpings, and figure the checks on the low side.’’

Why wouldn’t this work for the TWU?